One of the fabulous things about London is its diversity. I smiled when I read the bit about British accents because in some parts of London, you will hear everything but a British accent. Even in very expensive areas, just next door, literally, you will find very different neighbourhoods. Lovely photographs ... do you know the name of the area you visited?
I agree with this, London is a very multicultural city and there are neighbourhoods where you there is practically no british accent. I´m not sure how I feel about this but it is what it is.
Yes, the places are called Camden and Hackney.